Theory of Machine
Which of the following would constitute a link?

Piston, crank pin and crank shaft
Piston rod and cross head
Piston and piston rod
Piston, piston rod and cross head

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Theory of Machine
Higher pairs are those which have

Two elements that permit relative motion
Elements of pairs not held together mechanically
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion

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